Mick -
If your car is running well at slow speeds, it shouldn't be vapor lock.
Usually with vapor lock, the symptoms dissapear when you step on the gas,
because as fresh cold fuel starts getting pumped through the system faster,
it has less opportunity to vaporize.
It sounds to me either:
1) You have a clogged fuel filter or clog in the fuel line somewhere which
is restricting fuel flow
2) Your fuel pump is not pumping enough fuel (maybe it's old?)
3) Your fuel tank's pick up is clogged with rust or some other type of crud
4) Your mechanical advance on the carburettor is not working correctly
(maybe the contact breaker plate is stuck in place or some of the springs
are broken).
Good Luck!
Alan
'52 A90
'53 BN1
'64 BJ8
On 8/14/06, Mick Vander Ploeg <mvanderploeg@nc.rr.com> wrote:
>
> Could someone describe the symptoms of vapor lock? My '57 BN4 has had a
> persistent problem of sputtering when under load. Idles fine, revs fine,
> but
> when given the gas to go up a hill or something, it'll run extremely
> rough.
> When I say rough, I don't mean rough like when one cylinder is not firing,
> it's more like a very rapid sputtering.
>
> The timing's correct, the mixture's correct (per lifting the piston in SU
> method & plug color), valve clearance is fine, no vacuum leaks that I can
> find, & I've replaced the distributor cap, ignition wires, coil, plugs,
> points, rotor, & condenser. I'm out of ideas. Could it be a vacuum
> advance
> problem or does it sound like fuel?
>
> The vehicle is 100% stock other than a spin on oil filter, so it has the
> original "heat shield" (piece of metal) between carbs and exhaust manifold
> &
> has fuel pump located above exhaust pipe.
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